No, I don't think that at all. What I was trying to say was, if you had a magic way of determining exactly how many copies have survived to this day, I wouldn't be shocked if that number was 2000 - 3000. Not necessarily owned by collectors, but sitting in dealer's inventory, safe deposit boxes and safes, personal collections, and undiscovered in attics or boxed up in closets, etc.
Maybe 2000 - 3000 is too high. It's not a scientific number that I can "prove", just a guestimate based on how many copies seem to show up on a regular basis. I'm certainly not claiming to be an expert on Detective Comics #38, but I do attend a lot of comic book conventions, and I do buy golden age comics, and I have seen this book a lot.